Sorts and prints the integer set passed as program arguments.

intsort.c

Sorts and prints the integer set passed as program arguments.

intsort.c

#include <stdio.h>
#include <stdlib.h>

static int compare_ints(const void* a, const void* b);
static int *new_int_array(size_t sz);
static void sort_int_array(int *array, size_t sz);
static void print_int_array(const int *array, size_t sz, FILE *file);
static void delete_int_array(int *array, size_t sz);

int main(int argc, char** argv) {
	
	int i, *array;
	size_t nelems = argc - 1;
	if (argc <= 1) {
		fprintf(stderr, "Please inform the numbers to be sorted.\n");
		exit(1);
	}
	array = new_int_array(nelems);
	for (i = 0; i < nelems; ++i) {
		array[i] = atoi(argv[i + 1]);
	}
	sort_int_array(array, nelems);
	print_int_array(array, nelems, stdout);
	delete_int_array(array, nelems);
	return 0;
}

int compare_ints(const void* a, const void* b) {
	
	int va = *((int*) a);
	int vb = *((int*) b);
	return (va - vb) - (vb - va);
}

int *new_int_array(size_t sz) {
	
	int *array = calloc(sz, sizeof(int));
	if (!array) {
		fprintf(stderr, "Could not allocate array for %d ints. Exiting...\n", sz);
		exit(1);
	}
	return array;
}

void sort_int_array(int *array, size_t sz) {
	
	qsort(array, sz, sizeof(int), compare_ints);
}

void print_int_array(const int *array, size_t sz, FILE *file) {
	
	const char* sep = "";
	fprintf(file, "[");
		int i;
	for (i = 0; i < sz; ++i) {
		fprintf(file, "%s%d", sep, *(array + i));
		sep = ", ";
	}
	fprintf(file, "]");
}

void delete_int_array(int *array, size_t sz) {
	
	free(array);
}

intsort.png

Makefile

CC=gcc -c -o
PROG=gcc -o
RM=rm -f

CFLAGS=-Wall
LIBS=
PROGRAM=intsort.exe
OBJS=intsort.o

all: $(PROGRAM)

clean:
	$(RM) $(PROGRAM) $(OBJS)

$(PROGRAM): $(OBJS)
	$(PROG) $@ $? $(LIBS)

.c.o:
	$(CC) $@ $? $(CFLAGS)